Answer the questions in the table below about the shape of the phosphorus pentabromide (PBr5) molecule. How many electron groups are around the central phosphorus atom? Note: one "electron group" means one lone pair, one single bond, one double bond, or one triple bond. What phrase best describes the arrangement of these electron groups around the central phosphorus atom? (You may need to use the scrollbar to see all the choices.) (choose one)

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Following is a molecule with polar bonds whose shape was obtained using the VSEPR theory. Specify the molecular shape of this molecule, and whether the molecule is polar or nonpolar. (Hint: In terms of polarity, see whether the dipoles in the molecule cancel or not. A molecule containing polar bonds can be nanpolar if the dipoles cancel each other. You can imagine the dipoles as ropes pulling on the central atom–If the pulls cancel each other, that is, the central atom cannot move, then the molecule is nonpolar. If on the other hand the opposite is true, then the molecule is polar.) O trigonal pyramidal shape, nonpolar O trigonal planar shape, nonpolar O tetrahedral shape, polar O trigonal pyramidal shape, polar O trigonal planar shape, polar

Write the Lewis structure for the following molecule. State the electronic structure (shape based on electron pairs or bonds) AND the geometric structure (shape based on the atoms only). Include all valence electrons in your structure. State how many electrons are used to form covalent bonds in the molecule. Is the molecule polar? O2

When drawing the Lewis structure of the HCC13 molecule, the structure should represent a total of 26 valence electrons. What is the best description of the complete Lewis structure of the molecule? Select one: AH atom should be in the center with single bonds to each Cl atom and a double bond to the C atom. A Cl atom should be in the center with a single bond to the C atom and a single bond to the H atom. AC atom should be in the center with a double bond to the H atom and double bonds to each Cl atom. AC atom should be in the center with single bonds to each Cl atom and a single bond to the H atom.

Answer the questions in the table below about the shape of the sulfur hexabromide (SBr) molecule. How many electron groups are around the central sulfur atom? Note: one "electron group" means one lone pair, one single bond, one double bond, or one triple bond. What phrase best describes the arrangement of these electron groups around the central sulfur atom? (You may need to use the scrollbar to see all the choices.) (choose one) X Ś Um 0 G

Predicting and naming the shape of molecules with a central atom.

Draw a Lewis structure for the compound whose skeletal structure is provided to you below. Don't forget to draw in the H atoms! CH₂ HC CH 11 HC — CH, - Draw the Lewis structure by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons.

Consider the following ion: BrO3¯. a) Show the full electron configuration for Br. b) Draw the most correct Lewis structure for BrO3¯ and briefly explain why your Lewis structure is correct. c) If the structure is stabilised by resonance, draw at least one of the possible resonance forms. If it is not stabilised by resonance, briefly explain why. d) What is the electronic geometry of BrO3-? What is its molecular shape? e) Does BrO3 have a dipole moment? Briefly justify your answer. f) On average, would you expect IO3¯ to have longer or shorter bonds than BrO3¯? Briefly explain your answer. g) Which of the following molecules would you expect to have the lowest vapour pressure? Briefly explain your choice. Br HO HO. Br- Compound A Compound B Compound C h) What is the molecular formula for Compound C? What is the empirical formula for Compound C?

Answer the following questions about the Lewis structure for ammonium carbonate, (NHa)½CO3 There are ammonium ions and carbonate ions. There are ionic bonds in the molecule. Each ammonium ion has central atoms and valence electrons. In each ammonium ion, the central N has REDS, tH shape is (x), and the bond angles are The single carbonate ion has REDS and valence electrons. The carbonate ion has single covalent bonds, double covalent bonds, and triple covalent bonds. For the carbonate ion, the shape at the central C is and the bond angles are about а. О b. 1 С. 2 d. 3 е. 4 f. 5 g. 8 h. 10 i. 12 j. 14 k. 16 I. 18 m. 20 n. 24 О. 26 р. 30 q. 32 r. 34 S. 36 t. diatomic u. pyramidal v. linear z. bent w. monoatomic ions x. tetrahedral y. trigonal planar aа. 1200 bb. 180° ff. c. no bond angles, no central atom nonpolar dd. 109.5° ее. polar gg. ionic hh. O and O